Calendar Magic is an easy-to-use program that is entertaining, informative, educational and of equal applicability in the home and in the office. Calendar Magic has been tested on Windows 95, 98, Me, XP, Vista (32-bit) and Windows 7 (64-bit), and has also been reported to run without problems on other versions of Windows.

Dual Calendars” – full year calendars in various calendar systems which show, not only the months and days for a year in any one of the calendar systems, but also the corresponding Gregorian dates.

A month-by-month, side-by-side comparison of any two of the 25 calendar systems listed above. The display remains synchronised as you change day, month and year values in either calendar system being viewed. Again, users may choose between displaying each month with weeks starting on a Saturday, Sunday or Monday.

Date conversions among the 25 calendar systems listed above, plus conversions to Aztec Tonalpohualli, Aztec Xiuhpohualli, Balinese Pawukon, Thai solar, old Hindu Solar, old Hindu Lunisolar and Mayan date formats. Julian day value, day of week and day of year information is also displayed. For Gregorian dates, many other facts are displayed, such as modified Julian day value, Lilian day value and Rata Die day value, and year related information including Roman numeral form, Dominical Letter(s), Dionysian Period, Julian Period, Golden Number, Solar Number, Roman Indiction and Epact. Various special days are also recognised (e.g. Halloween), as are modern Olympic years, Commonwealth Games years, European Athletics Championship years, and World Athletic Championship years.

Conversion of British sovereign regnal dates to historical Julian (years beginning on Jan. 1) or Gregorian dates, as appropriate.

Conversion between ancient Greek Olympiad numbering and calendar years.